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I'm not sure that procmail's entirely declarative either, given that you can embed shell scripts within it (but then, I guess, those bits are no longer domain specific in quite the same way - as far as procmail is concerned they're data...)I still maintain that there are real DSLs that can be written and embedded within a general purpose language (regular expressions being the canonical example). Damian Conway's List::Maker is an example that uses a parser, but something like Object::Declare is, I'd argue,

I agree that you can use a flexible host language to write things that have a different feel from just a plain API, and that one might reasonably call those DSLs, and that making too fine a point about distinguishing the two isn’t a very productive use of time. But there’s a lot of hot air from parts of the Ruby camp about how that language has the DSL market cornered, without any objective criteria forthcoming about what other languages lack in that department. And I agree with chromatic that a